Union of Puerto Rico

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Puerto Rico
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The Union of Puerto Rico (Spanish: Unión de Puerto Rico, UPR), also known as the Union Party, was a major political party in Puerto Rico.

The UPR was founded in February 1904 by Luis Muñoz Rivera, José de Diego and others after the disbanding of the Federal Party. The party supported greater self-government for the island, though the party was divided between those in favor of independence or statehood. The party was highly successful electorally through the 1930s.

In 1924, the Union Party joined with dissident members of the Republican Party to form the Alianza ("Alliance"). This group generally supported autonomy for Puerto Rico.

In 1932, the Alianza reconstituted itself as the Liberal Party and formally endorsed independence. The Alianza's more conservative, pro-statehood faction broke off and joined with the Republicans to form the Republican Union.